1271997 has 8 divisors (see below), whose sum is σ = 1884480. Its totient is φ = 847980.

The previous prime is 1271987. The next prime is 1271999. The reversal of 1271997 is 7991721.

It is not a de Polignac number, because 1271997 - 2¹⁵ = 1239229 is a prime.

It is a plaindrome in base 16.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1271999) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 23529 + ... + 23582.

It is an arithmetic number, because the mean of its divisors is an integer number (235560).

2^1271997 is an apocalyptic number.

It is an amenable number.

1271997 is a deficient number, since it is larger than the sum of its proper divisors (612483).

1271997 is an equidigital number, since it uses as much as digits as its factorization.

1271997 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47120 (or 47114 counting only the distinct ones).

The product of its digits is 7938, while the sum is 36.

The square root of 1271997 is about 1127.8284444010. The cubic root of 1271997 is about 108.3499451186.

The spelling of 1271997 in words is "one million, two hundred seventy-one thousand, nine hundred ninety-seven".